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Chapter 3: Problem 27

Why must a helium balloon be held with a string?

Short Answer

Expert verified
Helium balloons rise due to buoyancy; the string provides a balancing downward force.

Step by step solution

01

Understanding Buoyancy

Helium is less dense than air. This means that a helium-filled balloon is buoyant. Buoyancy is the upward force that air exerts on objects that are less dense than the surrounding air.
02

Gravitational Force

Despite the buoyancy force, gravity is constantly pulling all objects, including the helium balloon, towards the earth. If not balanced by another force, the balloon would float away because the buoyant force is greater than gravitational pull for the helium balloon.
03

Using the String

The string provides a downward force. By holding the string, you counteract the upward buoyant force that makes the balloon float.
04

Equalizing the Forces

Holding the balloon with a string means you are providing a force that balances the upward buoyant force. This prevents the balloon from floating away into the sky.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Helium Balloons
Helium balloons are a popular choice for decorations and celebrations. But what makes them float? The secret lies in the properties of helium. Helium is lighter than air, which means it has a lower density compared to the surrounding atmosphere.
  • This lower density makes helium balloons have buoyancy, allowing them to rise.
  • The buoyancy principle states that an object will float if it is less dense than the fluid it is in.
  • For helium balloons, the air acts as the fluid providing the lifting force.
Thus, when filled with helium, balloons rise because they are lighter than the air around them. Without containment or a balancing force, they would ascend indefinitely.
Gravitational Force
The gravitational force is an essential aspect to consider when discussing helium balloons. Earth鈥檚 gravity pulls everything towards its center.
  • This force is what keeps us grounded and makes objects fall when dropped.
  • In the case of helium balloons, although they are buoyant, gravity is still acting on them, attempting to pull them back to the ground.
  • However, because the buoyant force from the helium is greater than the gravitational force acting on the balloon's mass, the balloon rises upward.
If gravity weren鈥檛 at work, the balloon would simply drift off without any counteracting force pulling it down.
Density and Buoyancy
Density and buoyancy are closely related phenomena that explain why objects float or sink. Density is the amount of mass in a given volume. Objects that have a lower density than the fluid they are in will experience buoyancy.
  • Buoyancy enables objects to counteract the force of gravity and float.
  • Helium has a much lower density than air, leading to a strong buoyant force.
  • This principle is why bottling helium in balloons causes them to rise.
The string tied to a helium balloon provides an opposing force that works against buoyancy, preventing the balloon from floating away. By holding the string, you add a downward force that counteracts the upward lift, securing the balloon in place.

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